Improved flask or retor l



` `UNITED, STATES PATENT OFFICE.

SIDNEYIIGEER, 0F NORWIGH, CONN EGTIGUT.

|MPR0VED FLAsK oa Pri-:Tom

Specification forming part of Letters Patent No. 43, [93, dated June 21, 1864.

.To all whom it may concern:

' Be it known that I, SIDNEY L. GEER, of' Norwich, in the county of New London and State of Gonnecticut, have invented a new and useful Improvement' in Flasks and Retorts for Chemical Uses, and I do hereby declare that the following is a full,l clear, and exact description thereof, which will enable others skilled in the art to make and use the same, reference being had to the accompanying drawings, makin g a part of this specification, 'in which- Figure 1 is a sectional elevation of my flask, and Fig. 2 is a plan View of itsfunder side, seen from below. v

Similar letters of reference indicate like parts.

Myinvention has for its object to introduce a new and improved retort for the use of chemists, dentists, and others in generating` nitrous oxide gas from nitrate of ammonia, and which is also applicable to other similar uses. The retorts in common usc for this purf pose are simply flasks of glass, and much expense is incurred in using them by reason of their great liability to be broken.

mit the locking of thellask-s to the pocket by Y filling the space flush with cementmg material.

Having thus described my invention, I claim as new and desire to secure by Letters Paten t- '.Ilic chemical flask or retort above desfri bed,

made of cla-y or any mineral compound glazed within and incased by a metal pocket around its sides and bottom, as a new article ot manufacture.

SIDNEY L. Gunn.

Witnesses: v

` WESLEY- W. BISHOP,

J oHN C. RIPLEY. 

